The Texas Air Quality Study involves measurements at
approximately 20 sites. Shown as squares in this map are the main
ground chemistry site (LaPorte Airport) and the base of aircraft
operations (Ellington Field). Shown as circles are the sites making
extensive measurements of fine particulate matter (Aldine, Houston
Regional Monitoring Network Site 3 (HRM3) and Deer Park). Shown as
triangles are sites making additional meteorological and chemical
measurements.